"Because so many of you have invested your time, your hearts, and your souls into these stories, we're once again asking for your help," the Russo Brothers said. "When you see Endgame in the coming weeks, please don't spoil it for others, the same way you wouldn't want it spoiled for you."

And, of course, the directors had to reference last year's rollout of "Avengers: Infinity War," when they started the hashtag #ThanosDemandsYourSilence.